Digital Holographic Interferometry for Temperature Measurement of Flame without Phase Unwrapping

Abstract

Fast and precise measuring technique is required for vigilant monitoring of risk assessment of fire. In the present work, digital holographic interferometry has been applied for temperature profile measurement of single and coalesced candle flames without undergoing the tedious phase unwrapping procedure. Hence, it has also reduced time and effort. The impact of wick thickness on the temperature profile of single and coalesced candle flames has also been investigated. It is inferred that the peak temperature of the single and coalesced candle flame diminishes with an increase in the wick thickness of the candle. It has also been deduced that the coalescence of flame enhances the peak temperature of the flame. Maximum enhancement of peak temperature (103 K) on the coalescence of flame has been observed in the merged flames of the thinnest wick. The experimentally calculated value of temperature is in proximity to the temperature measured through the thermocouple.

KEYWORDS:

• Digital holographic interferometry
• Single and coalesced flame
• Temperature measurement
• Wick thickness

Additional information

Notes on contributors

Nusrat Jabeen

Nusrat Jabeen has received BSc and MSc degrees from Patna University, India in 2010 and 2012, respectively. She is currently pursuing PhD from Indian Institute of Technology (ISM) Dhanbad. Her research interests include digital holography, designing and fabrication of holographic optical elements. Email: [email protected]

A. K. Nirala

A K Nirala has been working as a professor in the Department of Physics, IIT(ISM) Dhanbad for more than 16 Years. He joined the Department in 2003 as assistant professor. He has established two labs- Laser and Holography Lab and Biomedical Optics Lab. After completing MSc and PhD from IIT Delhi, Prof Nirala has worked in Japan, Germany and UK through AIST, BOYSCAST and Commonwealth Fellowships for three, six and six months, respectively as visiting researcher. He is presently coordinator of FDC, IIT(ISM) Dhanbad and published more than one hundred research papers in journals/conferences. His current areas of research are laser based interferometry, speckle metrology, holography, biomedical physics and image processing.